Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262l..25f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. L25-L28.
Astronomy and Astrophysics
Astrophysics
31
Light Curve, Peculiar Stars, Periodic Variations, Stellar Structure, X Ray Binaries, Neutron Stars, Stellar Flares, Stellar Radiation
Scientific paper
The peculiar X-ray binary system 2S 0114 + 65 has been observed by every X-ray satellite mission since its discovery by SAS 3 in 1977. A persistent feature of all the observations are outbursts on a time scale of about 3 hr. We have utilized the archival EXOSAT data, as well as published data and ROSAT all-sky survey data and show that the observed outbursts are describable by a 2.78-hr period at all epochs. From the data at hand we determine that the underlying clock mechanism has a Q value not less than 10. The pulse shape is qualitatively similar to those observed in EXO 2030+375 and similar mechanisms may be at work in both systems. We speculate on the intriguing possibility that the underlying clock may be the pulsations of the early B star member of the system, LSI + 65 10. If this hypothesis is the correct description of the system, then LSI + 65 10 should be observed to pulsate optically at the 2.78-hr outburst period, making it a member of the Beta Cephei class of pulsating early B stars.
Belloni Tomaso
Cassinelli Joe P.
Finley James P.
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